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2016ApJ...820...79B - Astrophys. J., 820, 79 (2016/March-3)

Spitzer observations of OGLE-2015-BLG-1212 reveal a new path toward breaking strong microlens degeneracies.

BOZZA V., SHVARTZVALD Y., UDALSKI A., CALCHI NOVATI S., BOND I.A., HAN C., HUNDERTMARK M., POLESKI R., PAWLAK M., SZYMANSKI M.K., SKOWRON J., MROZ P., KOZLOWSKI S., WYRZYKOWSKI L., PIETRUKOWICZ P., SOSZYNSKI I., ULACZYK K. (The OGLE Group), BEICHMAN C., BRYDEN G., CAREY S., FAUSNAUGH M., GAUDI B.S., GOULD A., HENDERSON C.B., POGGE R.W., WIBKING B., YEE J.C., ZHU W. (The Spitzer Team), ABE F., ASAKURA Y., BARRY R.K., BENNETT D.P., BHATTACHARYA A., DONACHIE M., FREEMAN M., FUKUI A., HIRAO Y., INAYAMA K., ITOW Y., KOSHIMOTO N., LI M.C.A., LING C.H., MASUDA K., MATSUBARA Y., MURAKI Y., NAGAKANE M., NISHIOKA T., OHNISHI K., OYOKAWA H., RATTENBURY N., SAITO TO., SHARAN A., SULLIVAN D.J., SUMI T., SUZUKI D., TRISTRAM P.J., WAKIYAMA Y., YONEHARA A. (The MOA Group), CHOI J.-Y., PARK H., JUNG Y.K., SHIN I.-G., ALBROW M.D., PARK B.-G., KIM S.-L., LEE C.-U., CHA S.-M., KIM D.-J., LEE Y. (The KMTNet Group), DOMINIK M., JORGENSEN U.G., ANDERSEN M.I., BRAMICH D.M., BURGDORF M.J., CICERI S., D'AGO G., EVANS D.F., FIGUERA JAIMES R., GU S.-H., HINSE T.C., KAINS N., KERINS E., KORHONEN H., KUFFMEIER M., MANCINI L., POPOVAS A., RABUS M., RAHVAR S., RASMUSSEN R.T., SCARPETTA G., SKOTTFELT J., SNODGRASS C., SOUTHWORTH J., SURDEJ J., UNDA-SANZANA E., VON ESSEN C., WANG Y.-B., WERTZ O. (The MiNDSTEp Collaboration), MAOZ D., FRIEDMANN M., KASPI S. (The WISE Group)

Abstract (from CDS):

Spitzer microlensing parallax observations of OGLE-2015-BLG-1212 decisively break a degeneracy between planetary and binary solutions that is somewhat ambiguous when only ground-based data are considered. Only eight viable models survive out of an initial set of 32 local minima in the parameter space. These models clearly indicate that the lens is a stellar binary system possibly located within the bulge of our Galaxy, ruling out the planetary alternative. We argue that several types of discrete degeneracies can be broken via such space-based parallax observations.

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Journal keyword(s): binaries: general - Galaxy: bulge - gravitational lensing: micro - planets and satellites: detection - space vehicles

Simbad objects: 4

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